Demonstration of an ultralow profile cloak for scattering suppression of a finite-length rod in free space

Soric, Jason; Chen, P. Y.; Kerkhoff, A.; Rainwater, D.; Melin, Kevin; Alù, Andrea

doi:10.1088/1367-2630/15/3/033037

Cited by 123 publications

(87 citation statements)

References 41 publications

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“…Nonetheless, inspired by transformation optics, there have been tremendous advances in cloaking. These include two-dimensional microwave cloaks [6,7], 'carpet' cloaks that hide objects under a surface [8,9], cloaking from scattering cancellation [10,11], and even cloaking in time [12,13] or from seismic waves [14]. A few groups have been able to cloak millimeter-to centimeter-sized objects as well, using birefringent materials [15,16].…”

Section: Introductionmentioning

confidence: 99%

Paraxial ray optics cloaking

Choi

Howell

2014

Opt. Express

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Despite much interest and progress in optical spatial cloaking, a three-dimensional (3D), transmitting, continuously multidirectional cloak in the visible regime has not yet been demonstrated. Here we experimentally demonstrate such a cloak using ray optics, albeit with some edge effects. Our device requires no new materials, uses isotropic off-the-shelf optics, scales easily to cloak arbitrarily large objects, and is as broadband as the choice of optical material, all of which have been challenges for current cloaking schemes. In addition, we provide a concise formalism that quantifies and produces perfect optical cloaks in the small-angle ('paraxial') limit.

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Section: Introductionmentioning

confidence: 99%

Paraxial ray optics cloaking

Choi

Howell

2014

Opt. Express

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“…The parameters of scattering cancellation based cloaks are homogeneous and helpful for experimental implementation. Some experimental verifications were carried out at microwave frequencies, for example, the plasmonic cloak [72,73], the three-dimensional plasmonic cloak [74], and the so-called ''mantle cloak'' [73,75]. The advantage of the method is that the total scattering of the cloak, which represents the cloaking performance, can be quantitatively calculated [3,76].…”

Section: Discussionmentioning

confidence: 99%

Towards omnidirectional, large scale, full polarization, and broadband practical invisibility cloaks: challenges and progress

Yang

Zhang

et al. 2014

EPJ Appl. Metamat.

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-Invisibility cloaks have experienced a tremendous development in the past few years, but the current technologies to convert the cloaks into practical applications are still facing numerous bottlenecks. In this paper, we provide the review of the challenges and recent progress in the invisibility cloaks from a practical perspective. In particular, the following key challenges such as non-extreme parameters, homogeneity, omnidirectivity, full polarization, large scale and broad band are addressed. We analyze the physical mechanisms behind the challenges and consequently evaluate the merits and defects of the recent solutions. We anticipate some compromises on the ideal cloaks are required in order to achieve practical invisibility cloaks in the future.

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“…In the future stealth technology which is limited to only reducing a turbine's RCS, may make way for technologies that can eliminate the RCS altogether. Recent advances in the development of metamaterials that make electromagnetic waves either appear to bend around objects or cancel each other out upon reflection could potentially act as 'invisibility cloaks' for wind turbines [42].…”

Section: Stealth Turbinesmentioning

confidence: 99%

Options to mitigate utility-scale wind turbine impacts on defence capability, air supremacy, and missile detection

2014

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There is increasing interest in, and concern over, the impact that the growing number of utility-scale wind farms are having on air supremacy and early warning missile detection in relation to radar clutter and shadow, seismic noise, and flight obstructions.This work identifies US defence industry concerns in relation to wind developments and conducts US industry interviews with representatives from the field of radar, the wind development industry, and government defence agencies. The results of the interviews provide detailed insights defining radar and military concerns raised around wind turbines and reveal that the US Department of Defense (DOD) have invested US $3 million to date on developing a suite of solutions to these concerns. This research discusses selected solutions available for the US DOD approval and alternative options that may be introduced to mitigate the impact of utility-scale wind turbines on defence and security. Implementing solutions will require greater cooperation between government agencies and wind developers, dedicated funding, a common research plan, and streamlined processes.

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Demonstration of an ultralow profile cloak for scattering suppression of a finite-length rod in free space

Cited by 123 publications

References 41 publications

Paraxial ray optics cloaking

Paraxial ray optics cloaking

Towards omnidirectional, large scale, full polarization, and broadband practical invisibility cloaks: challenges and progress

Options to mitigate utility-scale wind turbine impacts on defence capability, air supremacy, and missile detection

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